import java.util.concurrent.locks.ReentrantLock;

/**
 * 封装账户编号，账户余额两个成员变量
 */
public class Account {
    // 定义锁对象
    private final ReentrantLock lock = new ReentrantLock();

    private String accountNo;
    private double balance;

    public Account(String accountNo, double balance) {
        this.accountNo = accountNo;
        this.balance = balance;
    }

    public String getAccountNo() {
        return accountNo;
    }

    public void setAccountNo(String accountNo) {
        this.accountNo = accountNo;
    }

    // 账户余额不允许随便修改，所以只为balance提供getter方法
    public double getBalance() {
        return balance;
    }

    // 提供一个线程安全的draw()方法来完成取钱操作
    public void draw(double drawAmount) {
        // 加锁
        lock.lock();
        try {
            // 账户余额大于取钱数目
            if (balance >= drawAmount) {
                // 吐出钞票
                System.out.println(Thread.currentThread().getName() + "取钱成功！吐出钞票：" + drawAmount);
                try {
                    Thread.sleep(1);
                } catch (InterruptedException ex) {
                    ex.printStackTrace();
                }
                // 修改余额
                balance -= drawAmount;
                System.out.println("\t余额为：" + balance);
            } else {
                System.out.println(Thread.currentThread().getName() + "取钱失败！余额不足！");
            }
        } finally {
            // 修改完成，释放锁
            lock.unlock();
        }

    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Account account = (Account) o;
        return account.getAccountNo().equals(accountNo);
    }

    @Override
    public int hashCode() {
        return accountNo.hashCode();
    }
}
